Improvement in dust-caps for watch-regulators



UNITED STATES PATENT OFFICE.

WENZEL H. B. SOHMIED, OF NAPA, CALIFORNIA.

IMPROVEMENT IN DUST-CAPS FOR WATCH-REGULATORS.

S ecification forming part of Letters-Patent No. 156,313, dated October 27, 1874 application filed J une 27, 1874.

To all whom it may concern:

,Be it known that I, WVENZEL 11.13. SCIIMIED, of Napa, Napa county,-Oalifornia, have invented anew and useful Improvement in Watch es, of which the following is a specification:

This invention relates to new and important improvements in watches; and consists of a dust-cap arranged to cover and shield the hairspring and regulator-hand, and the more delicate portions of the watch-movement. It also consists in the mode of constructing the same.

In the drawing, Figure l is a vertical crossscction of Fig. 3 on the line at m. Fig. 2 is a vertical cross-section of Fig. 3, taken on the liney y; and Fig. 3 is a top View, showing the dust-cap and the manner in which it is secured to the plate.

Similar letters of reference indicate corresponding parts.

A is the upper plate of the watch-movement. B is the balance-wheel bridge. 0 is the regulatorhand. D is the dust-cap. This cap is preferably made of a brass or with a metallic frame, E, in closing a transparent or partiallytransparent plate, F-as mica, gelatine, or any similar substance but the cap may be made of a single piece of metal, if desired. This frame E is tightly fitted down onto the plate A and over the bridge and fastened or kept in place by means of the square-headed screws G G. These screws have each an eccentric Washer or flange, H, under the head, which, when the cap is fastened, are turned by means of a watch-key onto the narrow flange I of the cap-frame, which securely holds the cap in place. The dustcap is, therefore, easily removed when it is necessary to obtain access to the parts which are protected by it.

By means of this cap the hair-spring and more delicate portions of the watch-movement are protected from dust and consequent inury.

Having thus described my invention, Iclaim as new and desire to secure by Letters Patent As an article of manufacture, a dust-cap or protective covering for the regulating mechanism of a watch, constructed with a flanged base and shaped to fit over the regulating mechanism, as herein shown and described.

WENZEL HIERONYMUS B. SCHMIED.

Witnesses:

Form VAN BAAREN, GEORGE I GILES. 

